Poration



M. DE LEMON AND A. MALEC. ELECTRIC RESISTANCE WELDING MECHANISM.

APPLICATION FILED H.211, I920.

PatentedN0v. 7, 1922.

3 SHEEISSHEEI l.

mvenfom Max DeLemon Anfhony Md/ec M. DE LEMON AND A. MALEC.

ELECTRIC RESISTANCE WELDING MECHANISM APPLKCAHON FILED JMLZO, I920. 1,434,374. Patented Nov. 7, 1922.

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ELECTRlC RESISTANCE WELDING MECHMHSM.

APPLICATION FILED JAN-20, I920.

Patented N0". 7, 1922.

Max 09 Lemon hon Ma/ Z5 Af/"y.

21 on the ooirdirot-iii};hpliDtlti Current is =toth'e' conducting block9throughe conductrodes rcsistance'fpdt electrodes; "'13 reason"of the construction "of the "elect each of which extends throu h an opening in the'suppgrt; r loolrlgeu has its-upper end besimng t a sp'iing 16, the upper end of which located within an insulated l7 within I the, conducting, block 9, as

tor 22 which is connected therewith 'by means of jirj blkrdi'iigpost'23; ]5l 1e tip's'of the elec- 15 -erejprov'ided '-withscrew 'etreaaa which'are adapted to be received in the bod portions of the electrodes; and the lower en' 'of'th'coonducting ribbons 20 are secured. to the" electrodes by 'clampin'gthem between thwtips and the body portion thereof, as cleii'i'iisliown in Figs. 3 and-7:1

The arrangement oftneparts ortms elecnonsense? 'rovides'a rugged construction, .aiid' -'due' to efact that "th'efconducting mem'beruis 'thb'io'ughly insulatedfrom the er tsythe on'rr ent finds a low dirctly'fibni'tho lead to the surrounding es whereby tips may be removed without removing the'connecting condiictin'g" ribbons theseelectrodes may be easily removed and replaced when they have become worn' to thepointwhere they are no Ion eruseful.

e combined electrode'andholder comprise in general a. mandrel 25 preferably of.

copper 'wlthin 'whioh 'blre Iocated'n plurality of spring pressed pluuger'members 26-26 adapted'to be mo'vedupwerdly against the inner surface of a shell 27 by means of it plunger 28 hating 'aconicelcam surface 29 thereon whichengagesthe inner ends of the plungers. Upon the outer end of each of the spring pressed plunger membeis 26 is a strip 30 which in the operation of each of the plungers serves to expand the shell 27 against projecting shoulders 31-31- o a gauge block 32. The ange block 32 limits the expansion of the shedl to a desired outside diameter.

'The gauge block 32 is mechanically so cured to but electrically separated from a copper base plate 33 which also forms a sup-- port for the mandrel 25 which is :n'gidly cured to a collar portion 34 by means of :1. set screw 35. The supporting base 33 cm tends backwardly from the collar portion 34 andhas secured to it apeir o f p.hand operating members 36 and 37, the member 36 being ll 'lClly secured to the supporting plate 33, w ule the member 37 is pivotally supported thereon. At its pivotal cnd'the member 37 is provided with a forked lever arm 38which engages between collars 39 and 40 on the plunger 28 and is adapted to move the plunger 28 inwardly, theleby operating the plungers .26 through the cam surface 29 thereon to expand the shell 27 a inst the shoulders 31-31 of the gau e bloc r 32. The movement forward f the p lun or 28 is limited by the amount of energy w ich has been stored in a compression spring 41 interposed between-the collar 39 which is slidable on the plunger 28 and a collar 42 secured there, to when the hand 0 erated members 36 and 37 are operated. T e relative movement of the members 36 and 37 is. against a coil spring 45 which is interposed between the two members 36 and 37 and retained b means of projecting studs 46-and 47. hand controlled locking member is provided for locking the band 0 cratecl members 36 and 37 in their actuate position and oomprises a. lever 48 which is pivotally supported on the member 37 and is provided with a recesed rtion 50 adapted to engage a, pin 51 can-ie by the member 36. A ring 52 having one end connected with the ever 4:8 and the other with :1 projection 53 of the lug 47 serves to hold the lever 48 in its locked position. In order to release the lever pressure is applied to a. finger portion 54 and upon its release the members 36 and 37 will be forced apart by means of the spring 45 whereupon the plunger 28 will he withdrawn from its forward position, thereby permitting the spring pressed plunger members 26-26 to return to normal position.

The supporting plate 33 is adapted to slide between guides 60 provided upon a copper conducting bed plate 61 having an enlarged end portion 62 with which :1. current conducting lead 63 is connected. The guides 60-60 are preferably of steel and are mechanically secured to the plates 61 but insulated therefrom by means of suit able insulating strips 64-64. Located cen trally of the bed plate 61 is a pin 65 adapted to engage a recess 66 in the copper supporting plate 33 to position this plate on the bed plate. A steel insert 67 in the support ing plate 33 is provided with an opening registering with the recess 66 in the plate 33 to prevent excessive wear, due to repeated insertions and removals of the holder he- Lwceu the guides 60*60. A spring pressed plunger memher T0 which is supported in the enlarged portion 69 of the plate 61 but insulated there from is adapted to engage the cud f the she l 27 when the holder is in position and to exert pressure thereon against the action of we plungers26 to'slide'the shell against a locating plate 71 in'case the operator ha's'not properly ositionedthe shell 'on the mandrel against the platei'il and to maintain the shell in saidposition during the welding operation. The =bed plate on; supported upon a supporting .plate 75 upon which is also supported a fiber-guide-TG which" isada ted to receive and gdide "the supporting}; ate 33 into position to have spring pressed pivotal jaw members 77 and 78 engage the 'inner end "of the shell"27' to remove'it from the mandrel '25 after the release of the plunger 28. As shown in' El 12 the jmr'members 77 4 and 78 are pivotal y supported-upon a block 79 and have rearwardly extending members adapted to be normally drawn together by means of a sprin -so, thereby tending to draw the 'jaw members 7-7 and 78 toward each other'to engage the ed e ofthe shell 27. The'iuovemeet in one ireet'ion of these jaws is limited 'by means of a pin 82,'extending trans- 'vers'elyo'f the rearwardly extending inembers oft-he j aws 7'7 and 78, and in: the other cliret'ion "by means of two vertically arranged pins 83 and Sal'secured to the lock The mandrel zo is provided with an electrode '90 which-is remorably secured there to by means'o'f screws 91, 92, as shown particularly in Fig. 3. This is provided for the purposeof easy renewal of the electrode as it becomes worn and pitted from excesii'e use. Thi'selectrode 90 and the tips of electrodes 1515 n'r'e practically the only p'urts that will be worn to the extent necessitating frequent removals and replace'xnei'us.

In the operation of this mechanism a shell such asis shown in Fig. 9 is First inserted over the mandrel 25, which may be easily done by squeezing the tube together until it is of suiiiciently small diameter to extend between the lugs31-31 of the dollar 32. To facilitate 'positionino the shell'on' the mandrel with the overlapping surfaces to be welded positioned between theupper and lower electrodes a slot 93 is provided in the gauge block 32 and into \rliic 1 an outwardly projectin pin 94 enters. The pin 94 is secured to iihe shell diametrically opposite the overlapping surfaces thereof and is used in the mounting of the finished thermionic device. When in the proper position orer the mandrel .25 with its inside 'edgxein contact with the locating plate Tl the hand. operatingunembers 3G and 37 are moved toward each other thereby causing the inward or forward movement of the plunger '28 which operates the spring prcmod plungers 26-26 and the clamping strips 30-30 to expand the shell 2? against the shoulders 3l-3l"of the gauge block 32. The lever arm 48 acts automatically to engage the pin 51, thereby lochinjg the members 36 and 37 together to retain-the'plunger 28 in its forward-position. This' holde'r 15 new -ins'erted"-bet\he'en the guide 60 on the hediplate fil i'vith the pin therein engaginfifthe recess '66 of the conduetin lateto t .ereby ostti'o'n the pleteand iol der so'that u'p'on t e operation of th'eiam can-ying theelecti'odes $5 -15, these electrodes will-strikethe 'dverlt? Eng edges'of the shell 27 Qnda tireuitWhI "he bloc: 9, 'ribbon-coitdiitoi's '20 20, electrodes- 15-I5', the Wei-1h "ping edges" of shell 2'1, electrode "25, conducting'supporting-plate 33, liedpl'ate 61, and conductor 63.

After the welding operatioir-fihe operator will lift'fihe holder from 'h'tween-the guides 60- 60 and will insertit-With' sliding tion between-the guide'members ,of the uide T6, whereupon the jaws 77*:1'1'1d78 did" he'- eome engaged "with the",inneredge of the shell '27 s6'th at w*hen"the s ring pressed plung'ers are "released; due to the separation of'th li'dir'cldp e'relied'iheidbers 36 and 37', the withdrawal'ofthefiol' n w this holder" will eiusethe 'iv'ithdtiiiir'al of I the mandrel I 25 jfrom the 'shell 27. The holder will "then: be read for =9 il'dtiding and 'a re etitiou of the orego ing operation-i '1. In am'eqhanism for welding overlapping; "metallic- "surfaces" at "a plurality of points simultaneously, =5? welding heed coin prising i3; 'siippoitingplnte hd apwd to" farm a part of a movable mm; 'acuir'eiit'carry'iiig plate mechanically to but electrically separated 'fromsaid supporting 1am;- electrode camying 'bloek mechanically" secured to'hut electrically separated fron'i't'li'e current carrying plate; a. luralityj 'of'electrodes supportedin said'b olr' hut insulated therefrom, and connecting means fromsaid current carrying plate to shid'electrode's; 1

2.. In 'a welding mechanism; a welding head including a;current ca late, an electrode, a removable tip forsoi e ectrode,

and a current conducting memlier' extending between said and secured to the tip. I

3. In a mechanismfor welding the oven lapping-surfaces of'mtal parts," a combined plate and said electrode e ectrodehgi the removable portabldelectrode and holder for theparts tactiu'g meansfor engaging'the member to be mg said .expandingmembers;

a m ssy welded, an electrode carried by the,holdcr, and means including the holder for completing a circuit through the electrode.

n In a mechanismjortweld' the over lapping surfaces oftubula'r me members, a holder comprising a mandrel adapted to be inserted into the tubular-member, adjustable expanding means carried by the mandrel for expandingthe tubular member to a desired size,i.mcans to limit the;.expansionof the tubularmember, an electrode carried by the mandrel, and means for completin a circuit thro h the electrode.

7. 1% a mechanism or weldin the overlapping surfaces of tubular meta members,

a holder comprising a mandrel.- adapted to be insertedinto the tubular member,,a block provided with lugs surrounding the mandrel, adjustable members carried by said mandrel vadapted to,.expand the .tubulur member against thelugs, an electrodecan ried by sa dgnandrel and means 'for complet' aicircuitthrough said electrode.v

a mechanism 5 for welding the; overla ping surfaces of a tubular metal member, a holder comprisinga mandreLadapted to be inserted into thetubular member, a block 'proyidedwith inwardly projecting lugs surroundin said mandrehexpanding members carried by said mandrel for expanding the tubular member against the lugs, an electrode cari ied by;the.mandrel ini a position to engage the tubular member, below. the overlapping surfaces, and means for control- 9, In a device, forholding tubular metal members for welding the ouerlappingsur facsthercof, a mandrelmdapted to be insertd intothe tubular member, a block surroundin ;,mandre l,. expanding means carried by the mandrel adapted to cooperate with the block for maintaining the tubular member in welding position, and a reciprocally operated plunger for controllingthe operationof said expanding means; t

10. In adevioe for holding tubular metal members for welding the .overlarpping surfaces thereof, a mandrel adapte to e 111- sertedinto the tubular member, ablock with inwardly projecting lugs surrounding said mandrel, a plurality of. movable shoe members inv the mandrel adapted to cooperate with the block for maintaining the tubular member in welding position, radially disposed plungers inthe mandrel for operating the shoe members, and a longitudinally operated plunger extending into the mandrel and provided with a conical surface thereon for controlling the operation of the radially disposed plunger-s.

11 In a device for holding tubular metal members for Welding the overlapping surfaces thereof, a mandrel adapter to be inserted intothe tubular member, a block with inwardly projecting lugs surrounding said mandrel, e2; anding members carried by said mandrel or expanding the tubular member against the lugs carried by said block, a pair of levers for controlling the operation of the expanding members, and means for locking the levers to maintain said expanding members in operated osition.

12. In a device for holding tu ular metal members for welding the overlapping surfaces thereof, a mandrel for receiving the tubular member, an electrode carried by the mandrel, a supporting conducting plate for the mandreha secondconducting plate connected with one terminal of a source of energy, and meanspn said second plate for receiving and. positioning the supporting conducting plate.

13. In a device for holding tubular metal members for welding the overlapping surfaces thereof,a mandrel for holding and supporting the tubular member, an electrode carried by and in electrical contact with the mandrel, a supporting conducting plate carrying the mandrel, a second conducting .plate vconnected with. one terminal of a source; of energy, guide means on said secend plate for receiving and positioning said supporting conducting plate, and means carried by said second conducting plate adapt ed to cooperate with the mandrel to retain the tubular member in welding position.

14. In a device forholding tubular metal members for welding the overlapping surfaces thereof, a mandrel for rece vin and holding a tubular member, an electro e carried by and in electrical contact with said mandrel, a supporting conducting plate carrying the mandrel, a second conducting plate connected With one terminal of a source of energy, guide means on said second plate for receiving and positioning said supporting conducting plate with the tubular memher in welding position, and a spring pressed plunger carried by said second plate adapted to engage the end of the tubular shell to retain it against longitudinal movement on the mandrel during the welding operation,

15. In a welding mechanism, in combination a holder, a mandrel, for said holder adapted to receive a tubular member and hold it in position for welding the overlapping surfaccs thereof, and means for withillrnlwing the tubular member from the man- 16. In a welding mechanism, in combination a holder, a mandrel ada ted to receive :1. tubular member to be weld ed, expanding means associated with said mandrel for securing the tubular member in welding osition. means for operating said expanding means, and means for gripping and withdrawing the Welded member from the mandrel after the release of said expanding means.

IT. in a welding mechanism, in combination. a holder a mandrel for said holder adapted to receive a tubular member to be welded, a plate, at guide means on said plate adapted to receive and position said holder for welding the tubular member, a second guide means associated with said plate for receiving said holder, and means associated with said second guide means for Withdrawing;- a welded member from the mandrel.

18 In a device for holding metal members for welding the overlapping surfaces thereof a portable mandrel adapted to be in serted into the tubular member, and an electrode rcmovubly secured to said mandrel.

19 In a mechanism for welding metallic members, a movable ram, an electrode carried thereby and having one terminal of a source of welding current connected there with, a removable holder for the member to be welded, an electrode carried by the holder, and a stationary plate adapted to receive the removable holder and to form therewith a path for the welding current completed upon the operation of the movable ram.

In witness whereof, we hereunto subscribe our names this 30th day of December, A. D., 1919.

MAX DE LEMON ANTHONY MALEC. 

